CVE-2026-16730 MEDIUM

CVE-2026-16730: Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup

Vendor Red Hat
Product Red Hat Enterprise Linux 10
Weakness CWE-755
Published July 24, 2026
Last update August 14, 2026
View on NVD All CVEs

CVSS base score

5.5/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.

Key dates

02Disclosure timeline

July 24, 2026 CVE published
August 14, 2026 Record updated